Nothing to major, I think it covers about 1974-1982 with 76cc low compression heads. No power house for sure. Pretty much the normal engine used in cars and trucks, some are machined for 4 bolt mains but you will only know if you pull the pan.

Go to the back of block on the oposite side of casting #, so pass side and will find a code such as B9/9. which as an example be b is fir month so Feb then 9 is day and 2nd 9 would be year, so B/9/9 is Feb 9th of 1979. But that can some times fool you as in some cases could be Feb9th of 89 so that is where head # and date also cast into oposite side of cyl head accross from head casting # come in handy. Most 3970010 blocks cover quite a few years but only as I listed so can be narrowed down, but most casting # from Gm only cover a couple of years, yours just happens to be one of the only that stretchs it out. So take the date code off cyl head and decode it the same way and you can narrow it down.

Did some more checking 3970010 for 68 only is a 327 which could be verified with a crank casting # or 3970010 from 69-79 is 350 only. The date code can still be screwy on that on if it ends in an 8 then could be 68/327 or could be 78/ 350, so hope it isn't ending in an 8.

Man I have to talk to you on one thread at a time. I just went to a few sites and they showed the same crank flanges till 84, so not sure what you mean. Oh well let me know if you have a pic or 2, going to bed as have to work in a few hours. Later man.

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